Universal Access To All Knowledge
Home Donate | Store | Blog | FAQ | Jobs | Volunteer Positions | Contact | Bios | Forums | Projects | Terms, Privacy, & Copyright
Search: Advanced Search
Anonymous User (login or join us)
Upload

Reply to this post | Go Back
View Post [edit]

Poster: dead-head_Monte Date: Jan 25, 2011 9:58am
Forum: GratefulDead Subject: Edwin H. Armstrong and The Grateful Dead - FM Radio shows

Grateful Dead shows - FM Radio broadcasts (updated)

DeadHeads should respect Edwin Armstrong's contribution to our listening pleasure. We should be thanking this gentleman for all FM broadcasts - whether they are simulcast live, or they are tape-delayed and played back later. Light into Ashes and others produced a list of The Dead's FM broadcasts. There were dozens of Dead shows on our FM radios. Let's respect this man's historical contribution.

In 1933, Edwin H. Armstrong secured four patents which were to be the basis for frequency modulation (FM radio). This was an entirely new system of broadcasting. Unlike amplitude modulation (AM radio) which varies the amplitude or power of radio waves to transmit sound, frequency modulation varies the number of waves per second over a wide band of frequencies. As static is transmitted by amplitude modulation and cannot break into the wide band of frequencies of frequency modulation, the latter is virtually static–free. Armstrong, who enjoyed aphorisms, liked to quote defeatists who said, “Static, like the poor, will always be with us.” He proved them wrong.

Edwin H. Armstrong is The Father of FM Radio

Major E. H. Armstrong
arms2.jpg

December 18, 1890 – January 31, 1954
Edwin%20Armstrong.jpg

Armstrong Tower

103781885_8475c5a95b.jpg

Atop the Palisades at Alpine, New Jersey, across the Hudson River from Yonkers, stands a tall, three–armed tower. It is accepted as part of the landscape by those who live on the river’s east bank and is seen daily by thousands of commuters on Conrail’s Hudson Division trains, yet few know what this tower is or how it has affected their lives.

The tower and its accompanying radio station were built in 1938 at a cost of over $300,000 by Edwin Howard Armstrong, pioneer radio inventor, to demonstrate the superiority of his new system of radio broadcasting—frequency modulation (FM). After Promethean battles with the broadcasting industry, which fought to preserve its investment in the established system (amplitude modulation—AM), FM was finally accepted and today is the preferred system in radio, the required sound in TV, and the basis for mobile radio, microwave relay, and space communications.

As little known as the significance of the tower is the man who built it. Armstrong was born in New York City in 1890. When he was twelve years old, the family moved to 1032 Warburton Avenue—known to family and friends simply as “1032” in Yonkers. The house, which still stands just up from the Greystone railroad station, was declared an historical landmark in 1978 by the Yonkers Historical Society.

Next door, on the north side of the house at the corner of Odell Avenue, was 1040 Warburton Avenue, the home of Armstrong’s maternal grandparents. The members of the two families were a gregarious lot, and Howard’s childhood was a happy one filled with large gatherings of relatives, many of whom were teachers. Learning was prized. “Quick, boy! How much is nine times five, minus three, divided by six, times two, plus nine?” His great uncle, Charles Hartman, principal of New York City Public School 160 would quiz his nephew to encourage his mental agility.

When Howard was fourteen years old, his father who was American representative for Oxford University Press, bought him (on one of his yearly trips to London) a book, The Boy’s Book of Inventions. Reading of Guglielmo Marconi’s sending of the first wireless message across the Atlantic so excited his imagination that he determined then and there to become an inventor. In his attic room in the cupola overlooking the Hudson River, Howard Armstrong began tinkering with radio. In those days, broadcast sound consisted of Morse code signals picked up with earphones. The incipient young inventor set out to make them louder. He was dogged in his search and developed at this early age a capacity for infinite patience in his experiments which was to mark his life’s work. “Genius is one percent inspiration and ninety–nine percent perspiration,” he used to say in later years, quoting Thomas Edison.

Armstrong explored many paths in his attempts to strengthen the sound. Reaching up into the air to better catch the broadcast signals, he flew from the upper stories of 1032 large antenna kites which he had built with the help of his Yonkers friend, Bill Russell. He built a 125–foot antenna pole, the tallest in the area, in the south yard. His younger sister, Edith (“Cricket”), helped in the construction, holding the guy wires and handing him buckets of paint as he swung aloft in a boatswain’s chair. Neighbors watched with awe and apprehension. His mother, however, had complete faith in her son. When a neighbor telephoned to say that Howard was at the top of the pole and it made her nervous to watch, “Don’t look, then,” was her reply.

Howard attended Public School 6 in Yonkers and Yonkers High School, and went on from there to Columbia University, commuting on a red motorcycle his father had given him as a high school graduation present. His interest in radio led him to the study of electrical engineering.

In his junior year at Columbia, Armstrong’s diligent search for improved radio reception paid off. He invented the regenerative–oscillating, or feedback, circuit which greatly increased radio signals, made them loud enough to be heard across a room and led the way to transatlantic radio telegraphy. His sister, Ethel, remembers vividly the night it happened. “Mother and Father were out playing cards with friends and I was fast asleep in bed. All of a sudden Howard burst into my room carrying a small box. He danced round and round the room shouting, ’I’ve done it! I’ve done it!’ I really don’t remember the sounds from the box. I was so groggy, just having been wakened. I just remember how excited he was.”

Later, another inventor, Lee DeForest, challenged Armstrong’s priority for this discovery and the issue was twice argued before the US Supreme Court—which found in DeForest’s favor. However, the scientific community has always credited Armstrong for the invention and he received a gold medal for it from the Institute of Radio Engineers. Years later, the report accompanying the presentation to him of the Franklin Medal, by the Franklin Institute in Philadelphia, also credited him with the invention of the regenerative circuit.

arms4.jpg

After graduation from Columbia in 1913, Armstrong worked as an instructor at the college. When the US entered the war in 1917, he joined the Army Signal Corps and rose to the rank of Major—his preferred title for the rest of his life. While in the service, he invented the super–heterodyne circuit which amplified even further the sound of radio transmission. This invention brought him into contact with David Sarnoff, who became President of Radio Corporation of America and whose bright and attractive secretary, Marion Maclnnis, Armstrong later married.

After the war, Armstrong returned to Columbia where he worked as an assistant to Professor Michael I. Pupin, famed physicist and inventor. (Ed.note: Pupin lived at 7 Highland Place in Yonkers.) When Pupin died, Armstrong took over his professorship and, financing his own research—his inventions had by now made him wealthy—concentrated on the elimination of static.

The first public broadcast of FM was made in 1935 from the home of his friend C.R. (Randy) Runyon at 544 North Broadway in Yonkers. Runyon was a ham who operated under the call letters W2AG and broadcast from a tower in the yard of his house. The tower and the house are no longer standing. The Runyon living room served as a studio for a demonstration of different kinds of sound that were broadcast to a meeting of the Institute of Radio Engineers at the Engineer’s Building on West 39th Street in New York City. Water was poured, paper was crumpled, and live and recorded music were beamed from the Runyon tower to the audience forty miles away.

Although the engineers marveled at the fidelity of the sound, FM did not immediately take off and it would be some time before it would become a commercial success. “If you build a better mousetrap the world doesn’t necessarily beat a path to your door,” Armstrong said ruefully in later years as he fought for the acceptance of his new system of broadcasting. As a matter of fact, FM was so revolutionary that an entire industry had to scrap its hardware and start over before its potential could be realized. Understandably, the establishment was less than enthusiastic at the prospect.

arms5.jpg

However, for several years RCA gave Armstrong experimental broadcast privileges in its studio at the top of the Empire State Building. But in 1937, saying that they wished to devote the space to the development of TV, they asked Armstrong to withdraw. More determined than ever to prove the superiority of FM, Armstrong built his own station in Alpine, New Jersey. The site he chose had been visible to him as a boy from his attic cupola at 1032, and it served his purpose well. It was one of the highest points in the region and had unobstructed space around it for the broadcast of the station’s signal.

Programs originating with WQXR in New York City were transmitted by wire to Alpine and broadcast first under the call letters W2XMN and later, WE2XCC. Today, the station is owned by UA Columbia Cablevision Company of Oakland, New Jersey, and is operated for closed circuit TV transmission.

During the Second World War, Armstrong devoted himself to military research and allowed the government to use his patents royalty–free. He received the Medal of Merit for his contributions.

After the war, Armstrong turned his attention once more to the promotion of frequency modulation. He saw it grow in popularity as a broadcasting medium as more FM stations went on the air and more FM sets were sold to receive the programs. However, few outside the industry had ever heard of Edwin Howard Armstrong—the man who invented it. Furthermore, manufacturers began to build and sell FM equipment ignoring his patents. Goaded perhaps by the bitter memory of losing his regenerative patent years before, Armstrong became embroiled in twenty–one infringement actions to adjudicate his FM patents. Battling giant corporations with batteries of lawyers used up his resources. Finally, in 1954, ill, disillusioned, and his fortune gone, Armstrong took his own life.

arms6.jpg

After his death, his widow, Marion, set out to finish what he had started. She continued the lawsuits, sitting in the courtroom each day following the arguments and watching as testimony was given. Her first victory, over RCA in 1954, gave her funds to continue the other suits. In 1967, with the victory over Motorola, she had won all twenty–one and established clearly and decisively that Edwin Howard Armstrong was the inventor of frequency modulation.

Today, the Alpine tower stands as a monument to the brilliant man whose inventions touch our lives every day. His contributions are perhaps best summed up by Lawrence Lessing in his biography of Armstrong, Man of High Fidelity (J.B. Lippincott Company, Philadelphia and New York, 1956). “The lonely man listening to music in the night, the isolated farmer hearing nightly the news of the world, the airplane pilot guiding his craft safely through the ocean of the sky, the astronaut now in his capsule gathering in the whispers from space, the earthbound emergency crew contending with some mission of mercy or disaster, the army on the move and the man in his armchair, charmed or instructed for an hour by a great play a symphony, a speech, a game of ball—all owe a debt to this man who, in some forty years of high fidelity, fashioned the instruments illimitably extending these powers of human communication.”

— Jeanne Hammond EDITOR’S NOTE: The above article was written by Edwin Armstrong’s niece, Miss Jeanne Hammond, who owns the copyright. Miss Hammond’s mother, Ethel [Mrs. Bradley Hammond], was Edwin’s sister and a member of the Yonkers Historical Society. The Hammonds lived at 18 Odell Avenue for many years; Jeanne Hammond attended PS #25 and the Halsted School. This article was made possible by the efforts of editorial team member, Tom Flynn, who corresponded with Miss Hammond.


USA Cable Network was located at Armstrong Tower in 1982
Nework Operations Center

armstrong-tower-alpine-NJ.jpg

Monte Barry is the Engineer in Charge
usa-network-monte.jpg

John "JD" Cowles (left) and Terry
we telecast the first NBA games live on USA Network
usa-network-jd-terry.jpg

Seth Berkman and Monte Barry baby-sitting NBA game live-shot
usa-network-monte-seth.jpg

Ampex Video Tape Problem
usa-network-tape-problem.jpg



This post was modified by dead-head_Monte on 2011-01-25 17:58:19

Reply to this post
Reply [edit]

Poster: johnnyonthespot Date: Sep 15, 2009 12:39pm
Forum: GratefulDead Subject: Re: Edwin H. Armstrong and The Grateful Dead

can you answer if it's true what the band claims of 11-7-71 Harding Theater about the sound reaching the aud through the radio faster than in the hall? I have a hard time buying it.

Reply to this post
Reply [edit]

Poster: dead-head_Monte Date: Sep 5, 2010 10:33am
Forum: GratefulDead Subject: Re: Edwin H. Armstrong and The Grateful Dead

I finally d/l the Harding Theatre SBD yesterday. Today I listened to the Intro track. Jer says, "If you're sitting at home next to your radio, you're hearing the music faster than you are if you're in the hall. That's an interesting but true..." Bob says, "We won't bore you with lengthy explanations of this phenomenon." Then they shake out the last feedback tones in the PA system and the monitors. The sound crew are setting the equalizers, mix levels, and amps to eliminate feedback and optimize the sound.

The boys had a split-feed going off the SBD. This, of course, was common practice (feed A goes to the PA system, feed B goes to the monitors, feed C goes to the Betty Board). The PA feed is getting delayed as it goes through each device. There are equalizers, mixers, limiters, crossovers, amps, and the PA system. Sound boards have effects "send" and "return" feeds. Each device adds a slight time delay to the electronic signal. The total signal delay inside Harding Theatre is more than the signal delay of the raw unequalized audio signal mix being fed to a live shot that is microwaved directly to the radio station's FM transmitter.

There is only one way that a delay like what they describe could be noticed by anyone. You can see it with an audio signal test generator being fed into the system. Then you can measure the time differential on a 2-channel oscilloscope with the 2 different signals from the split-feed. The SBD mix fed to your FM radio was a few hundred microseconds faster than the SBD mix fed to the PA to the crowd. Jerry and Bob were discussing this.

Reply to this post
Reply [edit]

Poster: johnnyonthespot Date: Sep 5, 2010 12:27pm
Forum: GratefulDead Subject: Re: Edwin H. Armstrong and The Grateful Dead

Thanks Monte! and by the way that is one of my all time favorites. I especially love the tone Phil used to get. I don't care what the fans of five and six strings bass say, he got more to my ears out of those fours strings.

Reply to this post
Reply [edit]

Poster: laptap3r Date: Feb 2, 2011 3:21pm
Forum: GratefulDead Subject: Re: Edwin H. Armstrong and The Grateful Dead

I think a simpler, more likely explanation of the delay Jer and Bob were talking about was "light is faster than sound". The radio listeners were mostly closer to their speakers than the front row audience was to the PA stack, and the time it took the signal to travel from instrument to radio tuner was negligible. For perspective, in the same time a sound wave travels one foot from a speaker, an FM signal will travel 186 miles from the tower. That meant that even though it took a fraction of a second more for the signal to travel to the individual radio set than it took to travel to the PA stack, it took a much longer fraction of a second (up to half of one in the larger venues) for the sound wave to travel from the PA stack to the listeners' ears than it did to travel from home stereo speakers to a home listener's ears (most concertgoers would be more than fifteen feet from the stacks, up to three hundred, at a millisecond per foot - a home listener would be anywhere from five feet to no more than fifty).

Reply to this post
Reply [edit]

Poster: dead-head_Monte Date: Feb 5, 2011 9:07am
Forum: GratefulDead Subject: Re: Edwin H. Armstrong and The Grateful Dead

Thanks for your comments. This is an interesting scenario. Here's the explanation from my point of view.

speed of light is much faster: 186,282 miles per second
speed of sound is way slower: 768 miles per hour

I visualized an experiment in my mind when I commented about what Jer was saying. Furthermore, I tried to imagine what some of the circumstances would have been. Why would Jerry ever say something so unusual? Then I asked myself, what conversations may have been going on -- between the FM radio engineers, GD sound crew, and the band -- while they were setting up and fine tuning all their equipment?

I believe that Jerry mentioning the "radio [path] audio faster than the PA [path] audio" was because GD were impressed and inspired earlier that day with conversations the engineers were having with them. Perhaps they had shared troubleshooting and fixing some problems while they were setting everything up. Then I thought about it from there.

My mind's experiment is this:

a) Have a FM radio receiver monitor system (setup inside Harding Theatre) for their Radio path audio -- Put a mic 25 feet from these speakers. Feed this signal into Channel 1 on your oscilloscope.

b) For the Harding Theatre path PA audio -- Put a mic 25 feet from the PA speakers there. Feed this signal into Channel 2 on your oscilloscope.

Run a 1 Khz (1000 cycles) test signal from an Audio Signal Generator into channel 1 on GD's soundboard. The SBD's audio tone test signal outputs into the split-feeds. Measure these 2 signals on an oscilloscope. What do you see on the oscilloscope?

Externally lock the scope's time base reference by using the Audio Signal Generator's signal as an external reference. Set up your oscilloscope's time base by using Delayed Sweep mode. Maximize the scope's vertical amplifiers for best presentation on the scope's CRT display. Using this method, you will be able to measure exactly how much EACH path's delay is from the source - with respect to the Audio Signal Generator source. Then measure the difference. This is how I answered John's question.

The FM Radio live-shot had fewer electronic devices to delay signals in the A path. The PA System had lots of electronic devices to delay signals in the B path. Mathematically, sum together the delay totals for each path. This is my experiment's thesis. I find that the A path is faster (arrives sooner).

800px-Tektronix_465_Oscilloscope.jpg



This post was modified by dead-head_Monte on 2011-02-05 17:07:08

Reply to this post
Reply [edit]

Poster: Finster Baby Date: Sep 15, 2009 11:31am
Forum: GratefulDead Subject: Re: Edwin H. Armstrong and The Grateful Dead

Very interesting read Monte!! Unfortunately I didn't understand a single bit of the technical aspects. LOL

many thanks to the Major for all the hours spent in my lifetime listening to music on the radio.

Terms of Use (10 Mar 2001)